Space Gravity is a game about flying a space ship. The controls are simple: the ship will fly to wherever the player touches. He must be aware of the laws of physics and the fuel level of the ship at all times. There are two game modes: Classic and Adventure. The game is written in Swift, uses the SpriteKit framework, and uses the CloudKit and GameKit frameworks to save data to iCloud and report scores to the leaderboard.
In classic mode, asteroids fly in from off screen. The objective is to avoid the asteroids for as long as possible. The longer the player survives, the higher the score.
Adventure Mode takes place as a series of levels. The objective is to fly the ship to the goal. There are a variety of obstacles to overcome to make it to each goal.
There is an issue with audio right now. It can be heard every now and then but otherwise works smoothly.
Adventure Mode is currently incomplete. However, most of the work is done to allow for easy level creation. Simply create a new level in the levels folder with the format LevelX.sks and set Custom Class to AdventureModeScene, and the game will load that level file when tapped in the level select scene. Optionally, a transition message can be created in TransitionMessages.plist, with the key set to the appropriate level.
Crafting a level is done entirely within the Xcode scene editor. Note that the space ship will spawn at the origin. Objects can be added by dragging color sprites into the scene and setting the name. The image associated with the sprite does not have to be set; as long as the sprite is named, everything will be set up appropriately. There are, however, some options that can be set for certain objects. Sprites for some of these game elements have not been made yet. Until they are made and implemented, some sprites may appear as solid-colored boxes.
Asteroids are stationary objects in Adventure Mode. They will cause a game over if the ship crashes into it. The only property that can be set for asteroids is the position. Drag and drop the node where it needs to go and set the name to asteroid.
There can only be one goal in each level. Once the player reaches the goal, the level is completed and the scene transitions. The only property that can be set for the goal is the position. Drag and drop the node where it needs to go and set the name to goal.
Walls are stationary objects that react with ships exaclty the same way asteroids do. In addition to setting a position, walls can be made any size. Drag and drop the node where it needs to go, resize it, and set the name to wall.
A switch does not affect the way the ship flies in any way. Once the switch is activated, anything on the same channel is interacted with. After a set duration, the switch deactivates, and so does everything on the same channel. The channel cannot be set at this time; that is a feature in progress. Right now, the only object that can be affected by the switch are doors. Drag and drop the node where it needs to go, set the duration under User Data by setting the name to duration and setting the value to an integer, and set the name to switch.
Doors function exactly like walls, with the difference being that they can be opened and closed with a switch. Similar to switches, they are activated by any switch on the same channel. Drag and drop the node where it needs to go, set the channel under User Data by setting the name to channel and setting the value to an integer, and set the name to door.
Stardust are collectable items that can be collected. They can be thought of similar to coins in Mario games. To make best use of these, place them where it would be a challenge to reach or where they can be a guide to the player for a direction. The position is the only property that can be set. Drag and drop the node where it needs to go and set the name to stardust.
A wormhole is a portal which moves the ship to the another corrosponding wormhole. Each wormhole has an id and a destinationID. If the ship is flown into a wormhole, it will teleport the ship to the wormhole whose id is that wormhole's destinationID. Drag and drop the node where it needs to go, set the id and destinationID under User Data, and set the name to wormhole.
An alien will follow the ship wherever it goes at a defined set speed. If no speed is set, they similar to walls. The position and speed of the alien are the available properties to be set. Drag and drop the node where it needs to go, set the speed under User Data by setting the name to speed and setting the value to a float, and set the name to alien.
Slaloms are narrow passes that are designed to require precise flying to pass through. If the ship flies into the bounderies, it is game over. This is an experimental game element; they do nothing special right now. The width of the slalom is planned to be added. The only properties that can be set right now are the position and the rotation. Drag and drop the node where it needs to go, rotate it, and set the name to slalom.
Comets are obects that move endlessly between a series of points. The ship will crash if it hits a comet. The comet takes a position, size, move duration, wait duration, and a series of points. The initial position which the sprite is placed counts as the first position. Drag and drop the node where it needs to start and set the name to comet, then set moveDuration and waitDuration under User Data as floats. The series of positions must be entered as a JSON string under the key movePositions under User Data.
Turrets shoot rockets at a set rate. Rockets will destroy the ship if they hit it. They fly for a period of time before blowing up on their own. The configuration of these rockets is set on the turret's properties under User Data. The rate property is a float that defines the number of seconds between each rocket launch. The flightTime property is a float that defines the number of seconds the rocket will fly before blowing up. The flightSpeed property defines how fast a rocket will fly.
Space Gravity was developed by Bison Software in 2014. This version was developed as a remaster of that game by adding better art and graphics, new sounds, cleaner code, and the new Adventure Mode [in development].